using System;
using System.Diagnostics;
using System.Linq;
using VDash.Utilities;

namespace VDash.WindowSelectors
{
    public class FromProcessName : IWindowSelector
    {

        internal string m_ProcName = "";
        public string ProcessName
        {
            get
            {
                return m_ProcName;
            }
            set
            {
                m_ProcName = value;
                m_Processes = null;
            }
        }

        public FromProcessName(string procName)
        {
            if (string.IsNullOrWhiteSpace(procName))
            {
                throw new ArgumentNullException("procName", "procName must not be null, whitespace, or empty.");
            }

            ProcessName = procName;
        }

        public FromProcessName()
        {

        }

        Process[] m_Processes = null;
        public Process[] GetProcesses()
        {
            if(m_Processes == null)
            {
                m_Processes = Process.GetProcessesByName(ProcessName);
            }

            return m_Processes;
        }

        public Process GetProcess()
        {
            var procs = GetProcesses();

            if (procs.Count() <= 0)
            {
                throw new WindowNotFoundException($"No process found with name {ProcessName}.");
            }
            return procs.First();
        }
        public IntPtr GetWindowHandle()
        {
            return GetProcess().MainWindowHandle;
        }

        public WindowInfo GetWindowInfo()
        {
            var ret = WindowInfo.GetWindowList().SingleOrDefault(x => x.hWnd == GetWindowHandle());
            if(ret == null)
            {
                throw new WindowNotFoundException($"Unable to locate window for process {ProcessName}.");
            }
            return ret;
        }

        public bool WindowExists()
        {
            try
            {
                return User32.IsWindow(GetWindowHandle());
            }
            catch
            {
                return false;
            }
        }
    }
}